Adjustable pipe machining tool



Feb. 14, 1967 Original Filed July 14, 1959 J. B. GILL 3,303,732

ADJUSTABLE PIPE MACHINING TOOL 2 SheetsSheet 1 INVENTOR. JOHN B. GILLATTO RN E Y Feb. 14, 1967 J, 3,303,732

ADJUSTABLE PIPE MACHINING TOOL Original Filed July 14, 1959 2Sheets-Sheet a :EIG 5 INVENTOR. JOHN B. GILL ATTOR N EY United StatesPatent 3,303,732 ADJUSTABLE PIPE MACHINING TOOL John B. Gill, R0. Box2127, Torrance, Calif. 90503 ()riginal application July 14, 1959,'Ser.No. 827,043, now Patent No. 3,202,190, dated Aug. 24, 1965. Divided andthis application July 12, 1965, Ser. No. 509,446 7 Claims. (Cl. 82-4)This is a division of application Ser. No. 827,043, filed July 14, 1959,now issued as U.S. Patent No. 3,202,190.

This invention relates to improvements in an adjustable pipe machiningtool, and more particularly to tools for machining a tapered orcylindrical finish to the end of an asbestos cement pipe.

A tool of this type is disclosed in my US. Patent No. 2,916,955, andentitled Pipe Machining Tool.

These tools consist basically of an arm, or pair of arms, mountable onan arbor shaft which is positioned in concentric relation in the end ofa pipe to be machined. A screw feed is provided which advances the arms,and cutting tools carried thereon, toward the pipe when the arms arerotated around the arbor shaft.

In order to obtain the necessary precise adjustment of the cuttingtools, they are moved along the radially extending arms by means ofhandles which are threaded in the arms. Radial adjustment of the cuttingtools is effected by twisting the handles.

Where the machining tool is to be used with a much larger or smallerpipe than previously, adjustment of the cutting tools may requireconsiderable time and effort in twisting the handles.

The present invention contemplates a quick release connection betweenthe adjusting handles and the cutting tool which can be disegaged toallow the tool holder to be moved quickly to approximately the correctposition. The connection may then be engaged to provide for fine screwadjustment to the precise position required.

The quick release connection is provided in two forms, for use withmanually operated and motor driven pipe machining tools, with the partsbeing formed so that the same arbor and arm assembly may be employed ineither type of operation.

It is, therefore, a principal object of the present invention to providean adjustable tool for machining asbestos cement pipe in which the bladeholders may be released quickly and easily from the screw adjustmentmeans for repositioning on the arm, and in which the screw means maythen be reconnected to provide for precise adjustment.

Another object of the invention is to provide an adjusta-ble pipemachining tool having manually operable handles for adjusting the bladesrelative to the pipe to be machined, and for rotating the machining toolaround the .pipe; the handles being adapted to extend further outwardlywhen the blades are adjusted for the larger sizes of pipe, and withextendable auxiliary handles being provided in equally spacedcircumferential increments.

A further object of the invention is the provision of a pipe machiningtool of the character described in which the quick release connection isincorporated in the blade holder so as to adapt the machining tool foruse with a non-extending screw adjustment handle suited to motor drivenoperation.

Additionally, it is proposed to provide a quick release connectingdevice in a machining tool arm which will accommodate both an extendablemanually operable screw handle and a nen-extendable screw adjustinghandle, the device serving as a quick release screw connection with theextendable handle and as a keeper for the non-extendable handle.

A still further object of the invention. is. to provide a hub and armassembly for a machining tool of the character described in whichmounting means is provided in a form accommodating either a motor driveor auxiliary manually operable handles.

And finally, it is proposed to provide stoi members which cooperate withthe blade holders to insure return of the latter to a precisepredetermined position after operation of the quick release connection.

Further objects and advantages of my invention will be apparent as thespecification proceeds, and the new and useful features of my adjustablepipe maching tool will be fully defined in the claims attached hereto.

The preferred forms of my invention are illustrated in the accompanyingdrawings, forming part of this application, in which:

FIGURE 1 shows a front elevational view of a manually operable machiningtool constructed in accordance with the present invention and mounted inoperative position upon the end of an asbestos-cement pipe;

FIGURE 2, a front elevational view similar to that of FIGURE 1, butshowing a motor driven adaptation of the machining tool;

FIGURE 3, a fragmentary, vertical sectional view on an enlarged scale,taken substantial-1y on the line 33 of FIGURE 2;

FIGURE 4, a plan sectional view taken substantially on the plane of line44 of FIGURE 3;

FIGURE 5, a fragmentary vertical sectional view on an enlarged scaletaken substantially on the line 5-5 of FIGURE 1; and

FIGURE 6, a plan sectional view taken substantially on the plane of.line 66 of FIGURE 5.

While I have shown only the preferred forms of my invention, I wish tohave it understood that various changes or modifications may be madewithin the scope of the claims hereto attached, without departing fromthe spirit of the invention.

Referring to the drawings in detail, the adjustable pipe machining toolof the present invention consists basically of a frame 11 carried forrotation on an arbor 12 and having a cutting blade means 13 adapted formachining cylindrical or tapered surfaces on the end of a pipe 14 as theframe is rotated on the arbor.

The frame 11 here consists of a hub section 16 to which is secured apair of identical outwardly extending slotted arms 17 arranged atspacing. A screw feed connection 18 is provided between the frame 11 andthe arbor -12, this connection being effective to advance the .frametoward the pipe 14 as it is rotated. Details of such a screw feedconnection may be found in my aforementioned U.S. Patent No. 2,916,955.

The arbor may be of any suitable type which may be securely mounted inthe end of the pipe to be machined and with the arbor shaft concentricwith the pipe. An especially suitable arbor is disclosed and describedin US. Patent No. 2,607,376.

The cutting blade means 13 consists essentially of a tool block 19mounted for sliding movement along the slot in the arm 17 and adapted tosupport the required cutting blades. In this connection, it should benoted that any suitable blades may be carried on the block 19, thedrawings showing a cut-off blade assembly 21 and a machining blade 22attached to the tool block. Finishing and tapering blades (not shown)may be carried by the tool block 19' on the other side of the arms 17.

The tool blocks are here in two portions, the main block 19 and aclamping block 23 secured thereto by a longitudinal bolt 24. Blocks 19and 23 are provided with confronting shoulders which slide along theopposite sides of arm 17 when a nut 26 is loosened on bolt 24, and theparts are proportioned so that the shoulders clamp down upon the arm 17when the nut 26 is tightened. Such clamping insures that the tool blockwill stay in place once it is adjusted and during the actual machiningof the pipe.

In accordance with the present invention, fine adjustment of the radialposition of the tool block 19 is provided by a threaded rod 27, whichterminates in a manually engageable handle 28. Rod 27 extends along arm17 with the axis of the rod disposed so as to feed the blade assembly 21radially with respect to the arbor 12. The inner end of the rod 27 isprovided with a half-ball 29 engageable in a keyhole-shaped slot 31formed in the bottom of the clamping block 23. This structure insuresthat the tool block will move inwardly and outwardly with the rod, whileproviding for the clamping movement of the block 23.

A threaded connection is provided between the end of arm 17 and the rod27 so that twisting of the rod will move the rod and tool block in andout with respect to the pipe to be cut.

As a feature of the present invention, this connection is selectivelyreleasable, so as to allow free radial movement of the blade assembly 21carried by tool block 19, for gross adjustments, and may be quicklyre-engaged for fine screw adjustments.

As may best be seen in FIGURES and 6 of the drawings, the arm 17 isformed with a bore 32, adapted to receive and journal the rod 27, and anopen chamber 33 intersecting the bore 32.

Mounted for axial reciprocation in the chamber 33 is a manuallyengageable quick release element 34, here in the form of a short brassrod. A bore 36 is formed through the element 34 in position foralignment with the bore 32 in arm 17.

Bore 36 is somewhat larger than the rod 27 (see FIG- URE 6), and isprovided with a threaded section 37 which is engageable with the threadson the rod to provide the threaded connection. When the element 34 ismoved to disengage the threads, the rod is freely slidable through thebore 36.

Spring means is provided for yieldingly holding the element 34 indesired relation to the rod 27. For the purposes of the manuallyoperable unit, it has been found desirable to bias the spring means soas to urge the threaded section 37 into engagement with the rod 27. Thespring means is here provided in the form of a helical spring 38 mountedin the chamber 33 and compressed between the end of the element 34 andthe end Wall of the chamber.

Because the tool block 19 is attached to and moves with the inner end ofthe rod 27, it will be apparent that moving the tool block outwardly toaccommodate a larger pipe will also move the handle 28 outwardly a likedistance. This is advantageous in increasing the lever advantage bylengthening the lever arm. If the arm did not extend, there wouldactually be less leverage on the larger pipes and, in a manuallyoperable machining tool, the turning pressure required could exceed theability of the operator.

In order to take full advantage of the increased lever age, a pluralityof auxiliary handles 39 are provided in equally spaced circumferentialincrements around the pipe. The tool here shown utilizes twoframe arms17 and two auxiliary arms 41' arranged at right angles thereto.

The auxiliary arms each consist of a tube 43 secured in one of a pair ofparallel holes 44 formed in the hub 16, and a telescoping threaded rod46 similar to the rods 27. A nut 47 is threaded on the rod 46 and isattached to the tube 43 so that twisting of the handle 39 will move itinwardly or outwardly. If desired, a quick release connection similar tothe one in the end of arm 17 could be used at the end of tube 43. V

FIGURES 2, 3 and 4 illustrate the adjustable pipe machining tool of thepresent invention as set up for use with a motor drive 51. This drivemay consist of electrical or pneumatic motors driving an annular race52,.

which may be connected by suitable bolts to the frame 4 holes 44, themotor drive also having a control handle 53.

Such motors are widely available commercially and may be of the typescommonly used for opening and closing large gate valves.

The motor driven units are often used to machine the ends of pipe in alimited space, such as in a trench where repairs are to be made to pipealready installed. In such cases, it is desirable that the screwadjusting handles extend no further outwardly than is absolutelynecessary. Because the motor drive is powerful enough to machine allsizes of pipes, it is not necessary that the handles be extendable asthe tool holders are moved outwardly.

Accordingly, the machining tool is modified, in the manner best seen inFIGURE 3 of the drawings, by providing the screw adjustment in the formof a threaded rod 61 which does not move axially in the arm 17.

To adapt the machining tool, the rod 27 is removed by loosening nut 26(see FIGURE 5), and removing the clamping block 23. The element 34 isthen pressed in to release the threaded engagement and rod 27 iswithdrawn from the bore 32.

The block 23 is inverted, and a quick release device is positioned in anopen chamber 62 in that block. This quick release device consists of amanually engageable element 63 having a bore 64 therethrough which isslightly larger than rod 61. A portion 66 of the bore 64 is threaded forengagement with the threads of rod 61, and a spring 67 is compressed inchamber 62. It should be noted that the spring here normally tends topress the threads out of engagement.

The rod 61 is then inserted through the bores 32 and 36. The rod 61 alsopasses through the bore 64 in element 63, and the inner end of the rodapproaches the hub 16.

It willbe noted that the outer end 60 of the rod 61 is enlarged to adiameter corresponding to the outside diameter of the rod 27 which itreplaces. A peripheral groove 68 is formed in the end 60 in position toregister with the element 34-. The groove 68 is slightly wider than theelement 34 so that the latter will snap into the groove and act as akeeper to. prevent axial movement of the rod while permitting rotationthereof.

A handle 69 is provided on the end of rod 61 for twisting the rod andeffecting fine screw adjustment of the tool holder when the element 63is threadedly engaged with rod 61 by pressing the element toward arm 17.

A machine stop is provided in both forms of the machining tool so thatthe tool block 19 may be moved outwardly, as when being moved from onepipe to another, and then returned precisely to its original position.This stop is provided by a block. 71 proportioned to slide in theslotted arm 17, and having a clamping member 72 attached thereto by ascrew 73.

To set the stop, the block 71 is positioned against the inner face oftool block 19 and the screw 73 is tightened down to clamp the stop inplace. The tool block may then be moved inwardly by loosening nut 26.When it is desired to reposition the tool block, it is moved backagainst the stop block 71 and the tool block clamping nut is tighteneddown.

I claim:

1. In a pipe machining tool having an arbor positionable in concentricrelation to the end of a pipe and an outwardly extending arm mounted torevolve and advance along the arbor, a quick adjusting machining devicecomprising a tool block mounted for sliding movement along said arm andhaving a blade assembly thereon, a threaded rod journaled againstendwise movement in said arm with its axis disposed so as to feed saidblade assembly radially with respect to said arbor, a first quickrelease connection between said arm and said rod and a second quickrelease connection between said tool block and said rod for selectivelyproviding fine screw adjustment of the block on the arm when engaged andpermitting free movement of the block along the arm when disengaged.

2. In a pipe machining tool having an arbor positionable in concentricrelation to the end of a pipe and an outwardly extending arm mounted torevolve and advance along the arbor, a quick adjusting machining device,comprising a tool block mounted for sliding movement along said arm andhaving a blade assembly thereon, a threaded rod journaled againstendwise movement in said arm with its axis disposed so as to feed saidblade assembly radially with respect to said arbor, a first quickrelease connection between said arm and said rod and a quick secondrelease connection between said tool block and said rod for selectivelyproviding fine screw adjustment of the block on the arm when engaged andpermitting free move ment of the block along the arm when disengaged,said second quick release connection having a manually engageableelement formed with a bore slidable over a threaded radially extendingrod and having a threaded portion selectively engageable with said rodso as to provide fine adjustment upon rotation of the rod with thethreads engaged.

3. In a pipe machining tool having an arbor positionable in concentricrelation to the end of a pipe and an outwardly extending arm mounted torevolve and advance along the arbor, a quick adjusting machining device,comprising a tool block mounted for sliding movement along said arm andhaving a blade assembly thereon, a threaded rod journaled againstendwise movement in said arm with its axis disposed so as to feed saidblade assembly radially with respect to said arbor, a first quickrelease connection between said arm and said rod and a second quickrelease connection between said tool block and said rod for selectivelyproviding fine screw adjustment of the block on the arm when engaged andpermitting free movement of the block along the arm when disengaged,said second quick release connection having a manually engageableelement formed with a bore slidable over said rod and having a threadedportion selectively engageable with said rod so as to provide fineadjustment upon rotation of the rod with the threads engaged, and springmeans bearing on said manually engageable element for normally holdingthe latter in a desired relation to said rod.

4. In a pipe machining tool having an arbor positionable in concentricrelation to the end of a pipe and an outwardly extending arm mounted torevolve and advance along the arbor, a quick adjusting machining devicecomprising a tool block mounted for sliding movement along said arm andhaving a blade assembly thereon, a threaded rod journaled againstendwise movement in said arm with its axis disposed so as to feed saidblade assembly radially with respect to said arbor, a first quickrelease connection between said arm and said rod and a second quickrelease connection between said tool block and said rod for selectivelyproviding fine screw adjustment of the block on the arm when engaged andpermitting free movement of the block along the arm when disengaged,said second quick release connection having a manually engageableelement formed with a bore slidable over said rod and having a threadedportion selectively engageble with said rod so as to provide fineadjustment upon rotation of the rod with the threads engaged, and springmeans bearing on said manually engageable element for normally holdingthe latter in a desired relation to said rod, said spring means beingbiased to urge said threaded portion of the manually engageable elementout of engagement with the threaded rod, and locking means forreleasably clamping said tool block in adjusted position.

5. In a pipe machining tool of the character described, a toolsupporting frame, comprising a hub adapted for mounting on an arbor foraxial and rotative movement, a tool block, an arm extending outwardlyfrom said hub and formed for supporting said tool block for slidingmovement along the arm, said arm being formed with a bore for receivinga threaded rod, a first quick release means on said arm formed forselective engagement with said rod, and a second quick release meansconnected to said tool block and adapted for selective engagement with athreaded rod positioned in said bore.

6. A pipe machining tool as described in claim 5, wherein said firstquick release means comprises an open chamber formed in said arm andintersecting said bore, a manually engageable element mounted forreciprocation in said chamber and being formed with an openingtherethrough larger than and alignable with said bore, said openinghaving a portion formed with threads corresponding to the threaded rod,and spring means biased to urge said threaded portion against a rodpositioned in said bore,. and said second quick release means comprisesa clamping block connected to said tool block, said clamping block beingformed with an open chamber and an intersecting bore adapted forreceiving a threaded rod, a manually engageable element mounted forreciprocation in said chamber and being formed with an openingtherethrough larger than and alignable with said bore, said openinghaving a portion formed with threads corresponding to the threaded rod,and spring means compressed in said chamber and normally urging saidelement in a desired direction against said rod.

7. A pipe machining tool as described in claim 6, wherein each of saidfirst and second quick release means is adapted for conversion fromthreaded engagement with said threaded rod to journaled engagement withsaid rod in which the quick release means is journaled against axialmovement with respect to said rod, and wherein first and second threadedrods are provided, said first rod being adapted for journaled engagementwith said first quick release means and screw engagement with thethreads of said second quick release means, and said second rod beingadapted for screw engagement with the threads of said first quickrelease means and journaled engagement with said second quick releasemeans, whereby one of said rods may be quickly released from engagementwith said arm and said tool block and withdrawn from said arm andreplaced therein by the other of said rods, so that the tool may therebybe interchangeably and readily converted from one in which the rod movesaxially of the arm and the tool block remains axially fixed of the nod,to one in which the rod remains axially fixed of the arm and the toolblock moves axially of the rod.

References Cited by the Examiner UNITED STATES PATENTS 924,122 6/ 1909Williams 289 1,674,372 6/ 1928 Nonneman. 1,841,550 9/1930 Parker.1,860,846 5/1932 Watt 144-205 1,993,561 3/1935 Meglitz. 2,537,916 1/1951Rosenboom 144-205 2,607,376 8/ 1952 Montgomery 144205 2,746,497 5/ 1956Thompson 144-205 2,861,608 11/1958 Brown 144--205 WILLIAM W. DYER, IR.,Primary Examiner. HARRISON L. HINSON, Examiner.

1. IN A PIPE MACHINING TOOL HAVING AN ARBOR POSITIONABLE IN CONCENTRICRELATION TO THE END OF A PIPE AND AN OUTWARDLY EXTENDING ARM MOUNTED TOREVOLVE AND ADVANCE ALONG THE ARBOR, A QUICK ADJUSTING MACHINING DEVICECOMPRISING A TOOL BLOCK MOUNTED FOR SLIDING MOVEMENT ALONG SAID ARM ANDHAVING A BLADE ASSEMBLY THEREON, A THREADED ROD JOURNALED AGAINSTENDWISE MOVEMENT IN SAID ARM WITH ITS AXIS DISPOSED SO AS TO FEED SAIDBLADE ASSEMBLY RADIALLY WITH RESPECT TO SAID ARBOR, A FIRST QUICKRELEASE CONNECTION BETWEEN SAID ARM AND SAID ROD AND A SECOND QUICKRELEASE CONNECTION BETWEEN SAID TOOL BLOCK AND SAID ROD FOR SELECTIVELYPROVIDING FINE SCREW ADJUSTMENT OF THE BLOCK ON THE ARM WHEN ENGAGED ANDPERMITTING FREE MOVEMENT OF THE BLOCK ALONG THE ARM WHEN DISENGAGED.